Geoquiz: what in the world have you learned?

Written by John Flinn. Photos compiled by Andrea Waguespack.

Test your knowledge of the world around you.

Doug Pensinger/Getty Images

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Answer 27:It takes a little longer in Denver (above) because water there boils at a lower
temperature. In sea-level San Francisco, water boils at 212 degrees
Fahrenheit; in mile-high Denver it's about 202 degrees. Atmospheric
pressure drops as you rise in altitude, lowering water's boiling point.

Doug Pensinger/Getty Images

54of101

Answer 27:It takes a little longer in Denver (above) because water there boils at a lower
temperature. In sea-level San Francisco, water boils at 212 degrees
Fahrenheit; in mile-high Denver it's about 202 degrees. Atmospheric
pressure drops as you rise in altitude, lowering water's boiling point.